/* ── Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-0);
  color: var(--fg-0);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.65;
  min-height: 100dvh;
  overflow-x: hidden;
  position: relative;
}

/* ── Animated background ───────────────────────────────── */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 60% 55% at 15% 20%, rgb(0 229 255 / 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 85% 75%, rgb(168 85 247 / 0.07) 0%, transparent 60%);
  animation: blob-drift 20s ease-in-out infinite alternate;
  pointer-events: none;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

@keyframes blob-drift {
  0%   { transform: translate(0, 0) scale(1); }
  33%  { transform: translate(40px, -30px) scale(1.05); }
  66%  { transform: translate(-20px, 50px) scale(0.97); }
  100% { transform: translate(60px, 20px) scale(1.03); }
}

/* ── Typography base ───────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--fg-0);
}

h1 { font-size: clamp(var(--text-3xl), 6vw, var(--text-5xl)); }
h2 { font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl)); }
h3 { font-size: clamp(var(--text-xl),  3vw, var(--text-3xl)); }
h4 { font-size: var(--text-xl); }

p { color: var(--fg-1); max-width: 68ch; }

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
}
a:hover { color: #fff; }
a:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

ul, ol { list-style: none; }

img, svg { display: block; max-width: 100%; }

strong { color: var(--fg-0); font-weight: 600; }

code, pre, .mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--accent-cyan);
}

/* ── Utility classes ───────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

.accent-cyan   { color: var(--accent-cyan); }
.accent-violet { color: var(--accent-violet); }
.accent-green  { color: var(--accent-green); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--accent-cyan);
  background: rgb(0 229 255 / 0.08);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-full);
  padding: 3px 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.03em;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition:
    background var(--duration-base) var(--ease-out),
    box-shadow  var(--duration-base) var(--ease-out),
    transform   var(--duration-fast) var(--ease-out);
  text-decoration: none;
  padding: 0.65rem 1.6rem;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-violet) 100%);
  color: #070912;
}
.btn-primary:hover {
  box-shadow: 0 0 28px var(--accent-glow), 0 0 56px var(--accent-glow);
  color: #070912;
}

.btn-ghost {
  background: transparent;
  color: var(--fg-0);
  border: 1px solid var(--border-accent);
}
.btn-ghost:hover {
  background: rgb(0 229 255 / 0.06);
  border-color: var(--accent-cyan);
  color: var(--fg-0);
}